CN105118611A - Method for reducing partial heating of transformer shell - Google Patents
Method for reducing partial heating of transformer shell Download PDFInfo
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- CN105118611A CN105118611A CN201510407932.2A CN201510407932A CN105118611A CN 105118611 A CN105118611 A CN 105118611A CN 201510407932 A CN201510407932 A CN 201510407932A CN 105118611 A CN105118611 A CN 105118611A
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Abstract
The invention relates to a method for reducing partial heating of a transformer shell, aiming at solving the problems that a low-voltage side of the transformer shell is not made of a non-magnetism-conducting material so that overheat at the peripheries of a flange under a low-voltage sleeve and an ascending flanged base of the low-voltage side is caused by eddy-current loss when large current flows through the low-voltage side. The method is characterized in that according to a parallel circuit current diffusion principle, the current of a branch circuit with large resistance is small and the current of a branch circuit with small resistance is large; a short-circuit copper bar is additionally arranged at the periphery of a partial overheating part in the low-voltage ascending flanged base of the transformer shell to form a loop, so as to lead eddy current to the short-circuit copper bar which has smaller resistance and does not conduct magnetism; the copper bar is grounded so that the eddy-current loss is reduced and the temperature of an overheat point of the transformer shell is reduced. The heat dissipation effect is good, the construction is convenient and the cost is low; a detachable short-circuit copper bar structure is adopted so that the work including normal maintenance and overhauling and the like of a transformer is not influenced.
Description
Technical field
The present invention relates to electrical equipment technology, especially a kind of method reducing transformer case local pyrexia.
Background technology
Transformer utilizes the principle of electromagnetic induction to change the device of alternating voltage, a large amount of heats can be produced in its course of work, concerning power transformer product, it is exactly the most effectively the heat dissipation design of housing in prior art, if patent announcement number is CN204270788U, a kind of common transformer shell proposed, is fixed with multiple tracks fin in the periphery of casing, be arranged in parallel between all fin.If patent announcement number is CN203288385U, the cooling mechanism of a kind of transformer shell of design, there is demarcation strip, both sides, demarcation strip upper end are provided with framework, both sides, demarcation strip lower end are provided with feet, framework inner disc is wound with the conplane heat radiation oil pipe with framework, conduction oil is perfused with in heat radiation oil pipe, heat radiation oil pipe lower end passes demarcation strip and horizontal plate forms closed pipeline below demarcation strip, heat radiation oil pipe above demarcation strip forms thermal-arrest district and on outer tube wall, is distributed with heat conduction fin, heat radiation oil pipe below demarcation strip forms radiating area and in the feet of side, is provided with the fan of air port towards radiating area.For another example the housing area of dissipation that in use exists for the housing of existing square chest type transformer case for CN201984927U of patent announcement number is little, the one that radiating effect difference is carried out is improved, feature is housing is tubular shell, and fin is fixed on outside around tubular shell.
And transformer case is made primarily of steel plate at present, heating main cause is that inside transformer alternating magnetic field produces eddy current by electromagnetic induction at shell, thus causes local pyrexia.The method solving this local pyrexia mainly contains two kinds, and one is that transformer case uses non-magnet material, and stop alternating magnetic field to enter transformer case, thus the induced electromotive force produced is little, eddy current is very little, thus reaches the object reducing heating; Two is that inside transformer installs magnetic screen additional, magnetic screen is fixed on inside transformer inwall, makes magnetic leakage shielding in transformer case, and object does not make leakage field pass through in transformer case, avoids eddy current loss and generate heat.
And for the low-pressure side strong current transformer used now, because shell low-pressure side does not adopt non-magnet material, it is overheated that the low-tension bushing lower flange caused due to eddy current loss after putting into operation and periphery exist, low-tension bushing is caused to be in operation Decrepitation Phenomena, because unrealistic, the inner magnetic leakage shielding of this large-scale plant integral replacing is infeasible, so there are the methods of carrying out local and effectively processing, to meet technology needs.
Summary of the invention
The object of the invention is to solve because transformer case low-pressure side does not adopt non-magnet material, when low-pressure side is by big current, overheated problem is there is because eddy current loss causes low-tension bushing lower flange and low-pressure side to raise seat periphery, a kind of rational technology is provided, simple to operate, guiding has the method for the reduction transformer case local pyrexia of significant hypothermal effect.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of method reducing transformer case local pyrexia, it is characterized in that according to shunt circuit current distributing principle, the branch current that resistance is large is little, the little branch current of resistance is large, raise local hot spot in seat in transformer case low pressure and within one week, install short-circuiting copper bar formation loop additional, eddy current is guided to resistance less and on non-magnetic short-circuiting copper bar, and by copper bar ground connection, thus reduction eddy current loss, transformer case heat spot temperature is reduced.The technical program utilizes shunt circuit current distributing principle, i.e. the relation of resistance sizes and branch current size, is diverted to by maelstrom on short-circuiting copper bar, and by copper bar ground connection, and transformer case resistance is comparatively large, the eddy current of distribution is just little, thus reaches the requirement reducing transformer case temperature.This programme is arranging copper bar, during copper conductor, various ways layout can be carried out flexibly, for the structure of design of transformer radiating effect the best of different model, as wire and wire bonds, wire welds with copper bar (band), copper bar basis raises seat with step down side and welds, copper bar (band) is connected with earth rod (pole), often kind of weldering linked vector graph can adopt different connected modes according to actual conditions again, as wire adopts docking in wire, right-angled intersection, parallel connection, T-shaped connects etc., and on short-circuiting copper bar surface, the measure having more radiating effect is set, as fin etc.
As preferably, described short-circuiting copper bar is dismountable structure.Short-circuiting copper bar is dismantled and assembled, does not affect transformer normal service.
As preferably, described top of oil-tank, first weld copper bar basis, then short-circuiting copper bar is fixed on copper bar basis by mode with bolts.Make full use of existing space, concentrate and carry out eddy current shunting.
As preferably, described fuel tank vertical plane, adopts the linear formula of grounding copper to carry out short circuit welding.Ground connection copper cash adopts thick copper lines, and the general diameter of thick copper lines is greater than 5mm.Adopt thick copper lines form in welding smaller part position, space, and pool together ground connection.
As preferably, described on transformer case local hot spot solder shorts copper bar basis, described basis is provided with some connecting bolts.Realize dismantled and assembled, facilitate transformer Maintenance and Repair operation.
Effective effect of the present invention is: efficiently solve the problem that transformer case eddy current causes local pyrexia, be especially suitable for do not adopt non-magnet material or Magnetic Shielding Effectiveness bad and the transformer be in operation; Easy construction, cost is low; Dismountable short-circuiting copper bar structure, does not affect the operations such as the conventional maintenance maintenance of transformer.
Accompanying drawing explanation
Fig. 1 is a kind of top of oil-tank short-circuiting copper bar Welding Structure schematic diagram of the present invention.
Fig. 2 is the partial enlargement structural representation of Fig. 1 of the present invention.
Fig. 3 is a kind of fuel tank vertical plane thick copper lines Welding Structure schematic diagram of Fig. 2 of the present invention.
Fig. 4 is the right view of Fig. 3 of the present invention.
Fig. 5 is the A-A place sectional structure schematic diagram of Fig. 4 of the present invention.
In figure: 1. low pressure raises seat, 2. transformer case, 3. small space, 4. raise seat inner ground seat, 5. add grounding copper bar; M, N, P, Q are welding copper bus position, and K, V are copper cash layout points position.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
A kind of method reducing transformer case local pyrexia of the present embodiment, see Fig. 1, because limiting by main transformer interior condition, cannot install magnetic screen additional in the low pressure rising seat 1 in transformer case 2 side, low pressure raises seat 1 self and also cannot change.According to shunt circuit current distributing principle, the branch current that resistance is large is little, and the little branch current of resistance is large, eddy current is guided to resistance less and on non-magnetic short-circuiting copper bar, thus reduces eddy current loss, transformer case heat spot temperature is reduced.
Particularly, the low pressure in transformer case 2 side raises local hot spot in seat 1 and, along the installation foundation of one week solder shorts copper bar, bolt is established at interval of 50mm in basis, arranges by two rows.Then solder shorts copper bar is installed additional to form loop, as M, N, P, Q position in Fig. 2 at top of oil-tank; At fuel tank vertical plane welding smaller part position, space small space 3, install ground connection copper cash and earth cable additional, as K, V position in Fig. 3, Fig. 4; Flanging is carried out according to fuel tank situation in copper bar width both sides, and processes the installation round coordinated with bolt on basis, and copper bar finally will have good ground connection.When installing ground connection copper cash additional, each strand is arranged parallel to each other.
Seat 1 inside is raised in the following ways: first install additional and raise seat inner ground seat 4, then carry out additional grounding copper bar 5 and carry out reduction eddy current, as shown in Figure 5 in low pressure.
Below with concrete usage data situation in addition effect (using one group of main transformer as tested object) is described:
Table one is thermometric before main transformer body transformation, raises seat infrared image simultaneously carry out record to main transformer low pressure.
Table one: measure the date 5.11, weather is fine, ambient temperature 28 DEG C, ambient humidity 70%
Found out by table one and infrared image, before transformation, main transformer is under high temperature oepration at full load state, and it is obviously higher that its low pressure raises seat temperature.
Before and after main transformer body transformation, thermometric Contrast on effect as shown in Table 2.
Table two to August, is raising seat to main transformer low pressure and is carrying out infrared measurement of temperature record then June, and to verify main transformer low-pressure side case shell correctional effect, data analysis contrast is as follows:
Note: low pressure raises seat (the highest DEG C) on rising seat mesophase spherule circle top, low pressure raises seat (point 1 DEG C) on rising circle top, the seat left side, and low pressure raises seat (point 2 DEG C) on rising circle top, the seat left side.
Can obtain thus, before the transformation of this main transformer, it is obviously higher that its low pressure raises seat temperature, after transformation, under condition of similarity, namely under load, ambient temperature, humidity similar situation, low pressure raises seat temperature obvious reduction, mean temperature declines more than 15 DEG C, raises seat temperature effect highly significant after visible low-pressure side case shell external welding short-circuiting copper bar to reduction XX main transformer low pressure.
Above-described embodiment is to explanation of the present invention, is not limitation of the invention, anyly all belongs to protection scope of the present invention to the structure after simple transformation of the present invention, technique.
Claims (5)
1. one kind is reduced the method for transformer case local pyrexia, it is characterized in that according to shunt circuit current distributing principle, the branch current that resistance is large is little, the little branch current of resistance is large, raise local hot spot in seat in transformer case low pressure within one week, to install short-circuiting copper bar additional and form loop, eddy current is guided to resistance less and on non-magnetic short-circuiting copper bar, and by copper bar ground connection, thus reduction eddy current loss, transformer case heat spot temperature is reduced.
2. the method for reduction transformer case according to claim 1 local pyrexia, is characterized in that described short-circuiting copper bar is dismountable structure.
3. the method for reduction transformer case according to claim 1 and 2 local pyrexia, is characterized in that top of oil-tank, and first weld copper bar basis, then short-circuiting copper bar is fixed on copper bar basis by mode with bolts.
4. the method for reduction transformer case according to claim 1 and 2 local pyrexia, is characterized in that fuel tank vertical plane, adopts the linear formula of grounding copper to carry out short circuit welding.
5. the method for reduction transformer case according to claim 1 and 2 local pyrexia, is characterized in that described basis is provided with some connecting bolts on transformer case local hot spot solder shorts copper bar basis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510407932.2A CN105118611A (en) | 2015-07-13 | 2015-07-13 | Method for reducing partial heating of transformer shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510407932.2A CN105118611A (en) | 2015-07-13 | 2015-07-13 | Method for reducing partial heating of transformer shell |
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| CN105118611A true CN105118611A (en) | 2015-12-02 |
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| CN201510407932.2A Pending CN105118611A (en) | 2015-07-13 | 2015-07-13 | Method for reducing partial heating of transformer shell |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63289804A (en) * | 1987-05-22 | 1988-11-28 | Toshiba Corp | Foil wound transformer |
| CN201075330Y (en) * | 2007-05-24 | 2008-06-18 | 王贺阳 | Triangle ground-embedded voltage transformer |
| CN201765903U (en) * | 2010-08-31 | 2011-03-16 | 长春三鼎变压器有限公司 | Electric furnace transformer copper bar grounding structure |
| CN202487370U (en) * | 2011-12-31 | 2012-10-10 | 青岛青波变压器股份有限公司 | Low-voltage large-current sleeve locator |
| CN202940112U (en) * | 2012-01-12 | 2013-05-15 | 洛阳恒光特种变压器有限公司 | Strip-shaped magnetic shielding structure |
| CN202948827U (en) * | 2012-12-24 | 2013-05-22 | 保定天威保变电气股份有限公司 | Additionally-arranged copper shielding structure for cover of large transformer case |
| CN103578709A (en) * | 2012-08-11 | 2014-02-12 | 江苏启源雷宇电气科技有限公司 | Transformer current output bushing magneto-resistance plate |
| CN203481022U (en) * | 2013-09-26 | 2014-03-12 | 中国西电电气股份有限公司 | Assembling structure for mounting magnetic screens on clamping piece of large capacity transformer |
| CN103730238A (en) * | 2013-12-25 | 2014-04-16 | 保定天威保变电气股份有限公司 | Transformer oil tank magnetic shield with magnetic warning function |
| CN204087977U (en) * | 2014-09-28 | 2015-01-07 | 刘洋 | The buried energy-economic transformer of a kind of inner cone connecting-type |
-
2015
- 2015-07-13 CN CN201510407932.2A patent/CN105118611A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63289804A (en) * | 1987-05-22 | 1988-11-28 | Toshiba Corp | Foil wound transformer |
| CN201075330Y (en) * | 2007-05-24 | 2008-06-18 | 王贺阳 | Triangle ground-embedded voltage transformer |
| CN201765903U (en) * | 2010-08-31 | 2011-03-16 | 长春三鼎变压器有限公司 | Electric furnace transformer copper bar grounding structure |
| CN202487370U (en) * | 2011-12-31 | 2012-10-10 | 青岛青波变压器股份有限公司 | Low-voltage large-current sleeve locator |
| CN202940112U (en) * | 2012-01-12 | 2013-05-15 | 洛阳恒光特种变压器有限公司 | Strip-shaped magnetic shielding structure |
| CN103578709A (en) * | 2012-08-11 | 2014-02-12 | 江苏启源雷宇电气科技有限公司 | Transformer current output bushing magneto-resistance plate |
| CN202948827U (en) * | 2012-12-24 | 2013-05-22 | 保定天威保变电气股份有限公司 | Additionally-arranged copper shielding structure for cover of large transformer case |
| CN203481022U (en) * | 2013-09-26 | 2014-03-12 | 中国西电电气股份有限公司 | Assembling structure for mounting magnetic screens on clamping piece of large capacity transformer |
| CN103730238A (en) * | 2013-12-25 | 2014-04-16 | 保定天威保变电气股份有限公司 | Transformer oil tank magnetic shield with magnetic warning function |
| CN204087977U (en) * | 2014-09-28 | 2015-01-07 | 刘洋 | The buried energy-economic transformer of a kind of inner cone connecting-type |
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Application publication date: 20151202 |